Clustering error, when using a higher number of documents found

[gogasca]

[2019-12-09 06:02:02,883: INFO/Worker-4] Total news found: 3
[2019-12-09 06:02:02,883: INFO/Worker-4] Found 3 articles.
[2019-12-09 06:02:02,914: INFO/Worker-4] Processed 3 documents.
[2019-12-09 06:02:02,914: ERROR/Worker-4] Samples [3] should be greater of equal number of clusters [8].
Traceback (most recent call last):
  File "/usr/local/src/news_ml/main/appD.py", line 67, in process_clustering
    clustering_instance.process_articles()
  File "/usr/local/src/news_ml/services/clustering/k_means/ClusterD.py", line 281, in process_articles
    num_of_documents, self.num_of_clusters))
ValueError: Samples [3] should be greater of equal number of clusters [8].